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Carton, E.P. (author), Roebroeks, G.H.J.J. (author), Weerheijm, J. (author), Diederen, A.M. (author)Research on armor ceramics created only limited success in its search for relations between mechanical properties and the ballistic efficiency of this class of materials. Also TNO performed research on this subject using a range of experimental test set-ups (mainly using small and mid-caliber rounds) and diagnostic tools on a range of ceramic...conference paper 2018
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Bos, A. (author), Henselmans, R. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author)To enable important scientific discoveries, ESO has defined a new ground-based telescope: the European Extremely Large Telescope (E-ELT). The baseline design features a telescope with a 39-m-class primary mirror (M1), making it the largest and most powerful telescope in the world. The M1 consists of 798 hexagonal segments, each about 1.4 m wide,...article 2015
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Fischer, H.R. (author), Gelinck, E. (author), Semprimoschnig, C. (author), van Munster, M. (author), van der Heijden, J. (author)ct A direct bonding process relying on van der Waals forces offers an ideal combination of easiness to assemble and material compatibility. Such a bonding procedure, also denoted as optical bonding, is already known and used frequently in different applications. However, there are strict requirements to achieve optical bonding: (1) a high level...article 2015
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Mora, A. (author), Biermann, M. (author), Brown, A.G.A. (author), Busonero, D. (author), Carminati, L. (author), Carrasco, J.M. (author), Chassat, F. (author), Erdmann, M. (author), Gielesen, W.L.M. (author), Jordi, C. (author), Katz, D. (author), Kohley, R. (author), Lindegren, L. (author), Loeffler, W. (author), Marchal, O. (author), Panuzzo, P. (author), Seabroke, G. (author), Sahlmann, J. (author), Serpell, E. (author), Serraller, I. (author), van Leeuwen, F. (author), van Reeven, W. (author), van den Dool, T.C. (author), Vosteen, L.L.A. (author)The Gaia payload ensures maximum passive stability using a single material, SiC, for most of its elements. Dedicated metrology instruments are, however, required to carry out two functions: monitoring the basic angle and refocusing the telescope. Two interferometers fed by the same laser are used to measure the basic angle changes at the level...conference paper 2014
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Abadjieva, E. (author), Khoe, Y.S. (author)The interaction of thin ceramic tiles with AP8 (WC core, 7,62 mm) at 1000 m/s velocity has been studied experimentally and numerically. “Thin” ceramic tiles refers here to ratio of the tile thickness (t) to the projectile diameter, (d), t/d@ 1, as they are both in the same order. The method applied to visualize the penetration dynamics has been...conference paper 2013
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Abadjieva, E. (author), Carton, E.P. (author)The ballistic behavior of four different armor ceramic materials with thicknesses varying from 3 mm to 14 mm has been investigated. These are two types of alumina Al2O3 armor grades and two types of SiC armor grades produced by different armor ceramic producers. The ballistic study has been performed using the standard DoP technique with two...conference paper 2013
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Gielesen, W.L.M. (author), de Bruijn, D. (author), van den Dool, T.C. (author), Kamphues, F.G. (author), Mekking, J. (author), Calvel, B. (author), Laborie, A. (author), Coatantiec, C. (author), Touzeau, S. (author), Erdmann, M. (author), Gare, P. (author), Monteiro, D. (author)The Gaia mission will create an extraordinarily precise three-dimensional map of more than one billion stars in our Galaxy. The Gaia spacecraft2, built by EADS Astrium, is part of ESA's Cosmic Vision programme and scheduled for launch in 2013. Gaia measures the position, distance and motion of stars with an accuracy of 24 micro-arcsec using two...conference paper 2013
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Gielesen, W.L.M. (author), de Bruijn, D. (author), van den Dool, T.C. (author), Kamphues, F.G. (author), Meijer, E.A. (author), Calvel, B. (author), Laborie, A. (author), Monteiro, D. (author), Coatantiec, C. (author), Touzeau, S. (author), Erdmann, M. (author), Gare, P. (author)The Gaia mission1 will create an extraordinarily precise three-dimensional map of more than one billion stars in our Galaxy. The Gaia spacecraft2, built by EADS Astrium, is part of ESA's Cosmic Vision programme and scheduled for launch in 2013. Gaia measures the position, distance and motion of stars with an accuracy of 24 micro-arcsec using two...conference paper 2012
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Voigt, D. (author), Ellis, J.D. (author), Verlaan, A.L. (author), Bergmans, R.H. (author), Spronck, J.W. (author), Munnig Schmidt, R.H. (author)The accuracy of high-end industrial equipment and the reliability of produced goods can be limited by dimensional drift phenomena. Examples are the life cycle stability of instrumentation for space missions and the tight requirements for measurement uncertainty in the integrated circuit semiconductor industry. Re-calibration intervals of...conference paper 2011
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Gubbels, G.P.H. (author), van Drunen, C. (author), Böhm, G. (author), Arnold, T. (author), Kamphues, F.G. (author), Gielesen, W.L.M. (author)TNO Science and Industry has designed and is currently developing the Basic Angle Monitoring Opto-Mechanical Assembly (BAM OMA) [1], which is part of the GAIA spacecraft. In GAIA two telescopes mounted on a slowly spinning satellite will measure the position of the stars with an accuracy much higher as ever done before. Crucial in the system is...conference paper 2010
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Braam, B.C. (author), Meijer, E.A. (author), Nijenhuis, J.N. (author), Vink, R.J.P. (author), Kamphues, F.G. (author), TNO Industrie en Techniek (author)TNO is developing the Basic Angle Monitoring Opto-Mechanical Assembly for the GAIA mission of ESA, a space telescope that will create a map of the universe including distant stars and planets. GAIA is being built by EADS Astrium and scheduled for launch in 2011. Due to its stability and hardness properties, Silicon Carbide has been chosen for...conference paper 2009
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TNO Industrie en Techniek (author), Meijer, E.A. (author), Nijenhuis, J.N. (author), Vink, R.J.P. (author), Kamphues, F.G. (author), Gielesen, W.L.M. (author), Coatantiec, C. (author)To measure the relative motions of GAIA's telescopes, the angle between the telescopes is monitored by an all Silicon Carbide Basic Angle Monitoring subsystem (BAM OMA). TNO is developing this metrology system. The stability requirements for this metrology system go into the pico meter and pico radian range. Such accuracies require extreme...conference paper 2009
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van Veggel, A.A. (author), van den Ende, D.A. (author), Bogenstahl, J. (author), Rowan, S. (author), Cunningham, W. (author), Gubbels, G.H.M. (author), Nijmeijer, H. (author), TNO Industrie en Techniek (author)For bonding silicon carbide optics, which require extreme stability, hydroxide catalysis bonding is considered [Rowan, S., Hough, J. and Elliffe, E., Silicon carbide bonding. UK Patent 040 7953.9, 2004. Please contact Mr. D. Whiteford for further information: D.Whiteford@admin.gla.ac.uk]. This technique is already used for bonding silicate-based...article 2008
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TNO Defensie en Veiligheid (author), Nooij, S.A.E. (author), Bos, J.E. (author), Groen, E.L. (author), Bles, W. (author), Ockels, W.J. (author)During the first days in space, i.e., after a transition from 1G to 0G, more than 50% of the astro- (and cosmonauts) suffer from the Space Adaptation Syndrome (SAS).The symptoms of SAS, like nausea and dizziness, are especially provoked by head movements. Astronauts have mentioned close similarities between the symptoms of SAS and the symptoms...article 2007
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van Veggel, A.A. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author), Wielders, A.A. (author), Vink, H.J.P. (author), TNO Industrie en Techniek (author)Due to the 10 microarcsecond accuracy, with which Gaia will measure the positions of stars using 2 astrometric telescopes, stability requirements on the payload module are extremely stringent. In order to achieve the required 10 microarcsecond accuracy, a metrology system could be installed on the satellite to monitor variations on the basic...conference paper 2005
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TNO Industrie en Techniek (author), van Veggel, M. (author), Wielders, A.A. (author), van Brug, H. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author)The GAI A satellite will make a 3-D map of our Galaxy with measurement accuracy of 10 microarcseconds using two astrometric telescopes. The angle between the lines-of-sight of the two telescopes will be monitored using the Basic Angle Monitoring system with 1 microarcsecond accuracy. This system will be an interferometer consisting of a number...conference paper 2005
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TNO Defensie en Veiligheid (author), Maas, A.M.P. (author), van Vliet, F.E. (author)A low-noise X-band microstrip hybrid VCO has been designed and realised using a 2 × 50 um GaN-on-SiC pseudo-morphic HEMT as the active device. The transistor has been manufactured by TIGER and features a gate-length of 0.15 um, an fT of 22 GHz, a break-down voltage of 42 Volts and an Idss, close to 1 A/mm. The VCO has been assembled with...conference paper 2005
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TNO Industrie en Techniek (author), van Veggel, A.A. (author), Berkhout, W.J. (author), Schalkx, M.K. (author), Wielders, A.A. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author)The satellite GAIA will be launched in ca. 2010 to make a 3-D map of our Galaxy. The payload module of the satellite will carry two astrometric telescopes amongst other instrumentation. The optical bench and astrometric telescopes will be constructed for a large part in Silicon Carbide (SiC). A truss structure concept design was developed, which...conference paper 2005
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van Veggel, M. (author), Vink, R. (author), Rosielle, P.C.J.N. (author), Nijmeijer, H. (author), Wielders, A.A. (author)The GAIA satellite, scheduled for launch in 2010, will make a highly accurate map of our Galaxy. It will measure the position of stars with an accuracy of 50 prad using two telescopes, which are positioned under a 'basic' angle between the the lines-of-sight of the telescopes of 106°. With a Basic Angle Monitoring system, variations of this...conference paper 2004